extensionVersion() API returns the version of the Analytics extension that is registered with the Mobile Core extension.queue size if the getQueueSize API executed without any errors.queue size if the GetQueueSize API executed without any errors.queue size if the GetQueueSize API executed without any errors.queue size if the GetQueueSize API executed without any errors.getTrackingIdentifier might be null.Visitor Identifier string if the getVisitorIdentifier API executed without any errors.Visitor Identifier string if the GetVisitorIdentifier API executed without any errors.tracking identifier (AID) and the custom visitor identifiers (VID) stored in the Analytics extension and force deletes, without sending to Analytics, all hits being stored or batched on the SDK.